iOS Advanced (Network request)

1. Network Request mode

GET: The URL string url string up to 255 bytes all data transmitted to the server is displayed in the URL, directly visible, unsafe

POST: Large data is converted to binary number security

2. Connection mode

Synchronization connection: Program prone to deadlock phenomenon

Asynchronous connection: Waits for data to be returned (with proxy and block two ways) when creating the Request object, take the Nsmutableurlrequest object and set the request mode and body body

Postblock Asynchronous block

 //Create a Nsurlsession objectNsurlsession *session =[Nsurlsession sharedsession]; //Create a URL objectNsurl *url = [Nsurl urlwithstring:@"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx"]; //Create a requestNsmutableurlrequest *request =[Nsmutableurlrequest Requestwithurl:url]; [Request Sethttpmethod:@"POST"]; [Request sethttpbody:[@"date=20131129&startrecord=1&len=5&udid=1234567890&terminaltype=iphone&cid=213"Datausingencoding:nsutf8stringencoding]]; Nsurlsessiondatatask*task = [Session datataskwithrequest:request completionhandler:^ (NSData *data, Nsurlresponse *response, NSError *error) {        //parsingNsdictionary *dic = [Nsjsonserialization jsonobjectwithdata:data options:nsjsonreadingmutablecontainers|nsjsonreadingmutableleaves Error:nil]; NSLog (@"%@", DIC);    }]; [Task resume];

iOS Advanced (Network request)